溪洛渡拱坝泄水深孔应力分析  

Stress Analysis of the Deep Outlet in Xiluodu Arch Dam

作　　者：杨琼[1] 姚颖[1] 张建海[1] 王仁坤[2] 赵文光[2] 

机构地区：[1]四川大学水力学及山区河流开发与保护国家重点实验室水利水电学院,四川成都6100065 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《云南水力发电》2012年第4期49-55,共7页Yunnan Water Power

摘　　要：溪洛渡双曲拱坝坝身共布置7个表孔,8个深孔,以及10个导流底孔。其中深孔孔口尺寸为6m×6.7 m,泄水水头高105m,深孔出口处闸墩最大悬臂长达24.87 m,闸墩最小厚度为3.5 m,支撑大梁尺寸为8.0m×7.0m×5.0 m(长×宽×高),另外出口处弧门推力巨大,单孔弧门推力最高达82857 kN,其应力应变状态极为复杂。采用三维有限元法对溪洛渡拱坝建立精细整体模型,对深孔部位进行应力分析研究。分析表明:溪洛渡拱坝闸墩预应力吨位和布置合理,表现在深孔孔口应力在进口段、孔身以及出口段可以满足设计应力要求;对于工况三(正常蓄水+温降+弧门挡水)大坝运行时,支铰大梁和闸墩下游端部出现拉应力最大极值,拉应力分别为3.0MPa和2.6MPa,但是分布范围有限,可以通过适当配筋满足设计要求。另外,文中还与二滩拱坝中孔孔口应力进行了类比分析,结果表明溪洛渡深孔孔口应力与二滩中孔类似,孔口角缘压应力存在偏压现象,但由于溪洛渡拱坝孔口周围温降荷载小,使得溪洛渡孔口内壁拉应力极值小于二滩。Xiluodu double curvature arch dam deploys 7 upper outlets, 8 deep outlets and 10 bottom diversion outlets. The stress and strain are very complex because of the large size of the deep outlet orifice（6m×6.7m）, high hydraulic pre- ssure（105m）, and the huge gate thrust. Maximum cantilever length of the deep outlet pier exit is 24.87m, minimum width of pier is 3.5m and maximum gate thrust is 8,285.7t, and the size of the braced girder is 8.0m×7.0m×5.0m （length ×width ×height）. In this paper, a fine integral model was built to analyze the stress of the deep outlets parts ar- ea with three - dimensional finite element method. The study showed that the pier pre - stressed tonnage and arrangement are reasonable, showing that the stress in deep outlet orifice at the entrance section, hole section, exit section can meet the design requirements of stress. For case 3（normal water ＋ temperature drop ＋ arc gate working）, the down - stream end of the braced girder and pier reach maximum tensile stress（3.0Mpa and 2.6Mpa）, but the range is limited, so through proper reinforcement, the design requirements can be satisfied. In addition, an analogy analysis of orifice stress has been carried out with the middle hole of the Ertan arch dam. The results show that the stress of the deep outlet in Xi- luodu arch dam is similar to the stress of the middle outlet in Ertan arch dam. The orifice edge compressive stress shows bias phenomenon for both projects. But as a result of smaller temperature drop load around orifice of Xiluodu arch dam, the orifice inner wall of tensile stress value is less than Ertan arch dam.

关 键 词：双曲拱坝 深孔 闸墩 应力分析 有限元法 

分 类 号：TV314[水利工程—水工结构工程] TU311.2[建筑科学—结构工程]